Everywhere I read it tells me the Eviolite is in Castelia, but I've been looking around the city and I can't find it.
can I get like, detailed directions?
According to Bulbapedia the Eviolite ( ) is in Castelia City and you can receive it from a scientist in the Battle Company if over 25 Pokémon have been seen in the Pokédex .If you don't know where Battle Company this map should help you.
Map from Bulbapedia.
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